Taylor and Maclaurin series

Practice sheet

Fresh questions from the whole chapter, to do on paper.

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  1. Find the degree-2 Maclaurin polynomial of f(x)=e8xf(x) = e^{ 8x}.
  2. f(0)=−6f(0) = -6, f′(0)=−6f'(0) = -6 and f′′(0)=4f''(0) = 4. Write the degree-2 Maclaurin polynomial of ff.
  3. Find the degree-2 Taylor polynomial of f(x)=8ln⁡xf(x) = 8\ln x centered at x=1x = 1.
  4. On the interval, ∣f(2)(x)∣≤2|f^{(2)}(x)| \le 2. Bound the error of the degree-1 Taylor polynomial centered at aa, at a point with ∣x−a∣=12|x - a| = \tfrac{1}{2}.
  5. ∣f(3)(x)∣≤9|f^{(3)}(x)| \le 9 on [0,1][0, 1]. Bound the error of the degree-2 Maclaurin polynomial at x=1x = 1.
  6. The Lagrange error bound for the degree-4 Taylor polynomial uses the maximum of which derivative?
    1. f(5)f^{(5)}, the next derivative
    2. f(4)f^{(4)}
    3. ff itself
  7. Find the radius of convergence of ∑n=0∞xn8n\displaystyle\sum_{n=0}^{\infty} \dfrac{x^n}{ 8^n}.
  8. What is the interval of convergence of ∑n=1∞(x−7)nn\displaystyle\sum_{n=1}^{\infty} \dfrac{(x - 7)^n}{n}?
    1. [6,8)[6, 8)
    2. (6,8)(6, 8)
    3. [6,8][6, 8]
  9. Find the radius of convergence of ∑n=0∞(2x)n\displaystyle\sum_{n=0}^{\infty} (2x)^n.
  10. Find the coefficient of x3x^3 in the Maclaurin series of e5xe^{ 5x}.
  11. ∑n=0∞(−1)n(1x)2n+1(2n+1)!\displaystyle\sum_{n=0}^{\infty} \dfrac{(-1)^n (1x)^{2n+1} }{(2n + 1)!} is the Maclaurin series of which function?
    1. sin⁡(1x)\sin(1x)
    2. cos⁡(1x)\cos(1x)
    3. e1xe^{ 1x}
  12. Find the coefficient of x4x^4 in the Maclaurin series of cos⁡(2x)\cos(2x).